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An Apparatus for Regulating Voltage by Using Header Devices with Variable Gate Voltage

IP.com Disclosure Number: IPCOM000237598D
Publication Date: 2014-Jun-26
Document File: 1 page(s) / 30K

Publishing Venue

The IP.com Prior Art Database

Abstract

An apparatus for regulating voltage by using header devices with variable gate voltage is disclosed. The apparatus uses header and footer devices such as N channel Field Effect Transistor (NFET) and P channel FET (PFET) to regulate voltage.

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An Apparatus for Regulating Voltage by Using Header Devices with Variable Gate Voltage

Disclosed is a method and system for regulating voltage by using header devices with variable gate voltage. The apparatus uses devices such as N channel Field Effect Transistor (NFET) as header devices or P channel Field Effect Transistor (PFET) as footer devices. Due to factors such as source follower characteristics of NFET in relaying a supply voltage Vdd and PFET in relaying a zero voltage, the voltage drop across the devices can be controlled directly by altering the gate voltages of the devices.

In an embodiment, a NFET device is used as a header device. Due to the source follower characteristics of the NFET, the gate input of the NFET header must reach a value of Vdd+Vt in order to provide a good current drive strength during full voltage operation, wherein Vt represents the threshold voltage. When a low value of Vdd is required, then the NFET gate voltage is reduced in such a way that the available voltage on the virtual Vdd is reduced. For example if the NFET gate voltage is dropped from Vdd+Vt to Vdd the virtual Vdd is reduced to Vdd-Vt.

By altering the NFET gate voltage in such a manner, voltage regulation of the virtual Vdd is achieved at which a circuit such as a core or processor operates .

The apparatus also enables use of a single higher supply voltage at the inputs of the chip with reduced losses. The input voltage is then regulated down to the desired virtual...